[R-390] Intermittent

[Steve Hobensack]

I have been troubled with an audio intermittent for a quite a while. The audio will jump to a
low level and snap back a minute or so later. This will happen many times a day. The carrier level is not affected. I have traced
the problem to IF transformer t-503. It is the transformer that couples the last IF tube (6ak6) to the detector (5814a). When the audio is low, pulling the cover from t-503 will increase the volume. I can momentarily touch a clip lead across the primary, and the radio will snap back to
normal and maybe stay that way the rest of the day. There are three components shunted
across the primary. Those are a Q swamping resistor, a pink colored square mica cap, and
a brown encapsulated tubular ceramic cap. Before I do micro surgery, which one of  those components might be the culprit? What are the values of those capacitors?
Thanks
Steve N8YE
 		 	   		  
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